Thin Clients and Ultra Thin Clients

There's a distinction made between fat clients and thin clients, but a lot of people overlook the difference between the different types of thin clients. For instance, Wyse thin clients aren't as thin as Sun Ray thin clients. The former run embedded versions of operating systems, while the latter runs a firmware. Sometimes, Sun Ray-types are referred to as ultra thin clients, which is probably where the "ut" prefix on Sun Ray commands comes from. The security track record of Sun Rays are also comparably superior. Wyse thin clients, on the other hand:
'Secure' Wyse thin clients vulnerable to remote exploit bugs